Epstein was irate that he suffered consequences others didn't (I'm not saying he didn't do more than others). He was thoroughly red-pilling and making comments more about how he believed what he did should be okay.

And being so irate about such things, it's not unreasonable to think "Fuck my handlers (whoever they are, if they exist, Mossad or otherwise), they didn't protect me, so screw it".

Occam's razor and such, but it's also entirely possible that he could have been being blackmailed by the Russians while "working for" Israel - or for that matter, vice versa.